Sackey experienced problems with his calf during the Six Nations before suffering the leg injury on his return to action against Bristol in April of this year.
The 29-year-old had originally hoped to be fit again in time for his side's Guinness Premiership opener against Harlequins on September 5 but that target now appears unrealistic.
"I haven't started running yet and it may be that I miss one or two games at the start of the season," said Sackey.
"But that's better than rushing back too quickly and maybe suffering another injury as a result.
"My leg was broken in two places last season but it is healing well. I flew to Poland last Monday to join the club's pre-season training and continue my rehab with sessions in the pool and in the special cryotherapy chamber they have out there."
Despite the disappointment of possibly sitting out the early weeks of the new season, Sackey remains confident that he will return to action as a better player.
The former London Irish star is refusing to set a date for his return but, when he does step back on to a rugby field, he is determined to recapture the form that saw him establish himself as his country's first-choice wideman since making his debut back in November 2006.
"When you set a date you put much more pressure on yourself. I'm not putting any dates in my head, I'm taking it steadily and not rushing.
"As soon as the leg is strong and ready to go out there, that's when my date is. When I come back I want to be 100 per cent and hopefully fitter, stronger and faster than ever."